user/dev discussion of public-inbox itself
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# Copyright (C) 2021 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>

# parent class for LeiImport, LeiConvert
package PublicInbox::LeiInput;
use strict;
use v5.10.1;
use PublicInbox::DS;

# JMAP RFC 8621 4.1.1
# https://www.iana.org/assignments/imap-jmap-keywords/imap-jmap-keywords.xhtml
our @KW = (qw(seen answered flagged draft), # widely-compatible
	qw(forwarded), # IMAP + Maildir
	qw(phishing junk notjunk)); # rarely supported

# note: RFC 8621 states "Users may add arbitrary keywords to an Email",
# but is it good idea?  Stick to the system and reserved ones, for now.
# The widely-compatible ones map to IMAP system flags, Maildir flags
# and mbox Status/X-Status headers.
my %KW = map { $_ => 1 } @KW;
my $L_MAX = 244; # Xapian term limit - length('L')

# RFC 8621, sec 2 (Mailboxes) a "label" for us is a JMAP Mailbox "name"
# "Servers MAY reject names that violate server policy"
my %ERR = (
	L => sub {
		my ($label) = @_;
		length($label) >= $L_MAX and
			return "`$label' too long (must be <= $L_MAX)";
		$label =~ m{\A[a-z0-9_](?:[a-z0-9_\-\./\@,]*[a-z0-9])?\z}i ?
			undef : "`$label' is invalid";
	},
	kw => sub {
		my ($kw) = @_;
		$KW{$kw} ? undef : <<EOM;
`$kw' is not one of: `seen', `flagged', `answered', `draft'
`junk', `notjunk', `phishing' or `forwarded'
EOM
	}
);

sub check_input_format ($;$) {
	my ($lei, $files) = @_;
	my $opt_key = 'in-format';
	my $fmt = $lei->{opt}->{$opt_key};
	if (!$fmt) {
		my $err = $files ? "regular file(s):\n@$files" : '--stdin';
		return $lei->fail("--$opt_key unset for $err");
	}
	return 1 if $fmt eq 'eml';
	require PublicInbox::MboxLock if $files;
	require PublicInbox::MboxReader;
	PublicInbox::MboxReader->reads($fmt) or
		return $lei->fail("--$opt_key=$fmt unrecognized");
	1;
}

# import a single file handle of $name
# Subclass must define ->input_eml_cb and ->input_mbox_cb
sub input_fh {
	my ($self, $ifmt, $fh, $name, @args) = @_;
	if ($ifmt eq 'eml') {
		my $buf = do { local $/; <$fh> } //
			return $self->{lei}->child_error(1 << 8, <<"");
error reading $name: $!

		# mutt pipes single RFC822 messages with a "From " line,
		# but no Content-Length or "From " escaping.
		# "git format-patch" also generates such files by default.
		$buf =~ s/\A[\r\n]*From [^\r\n]*\r?\n//s;
		$self->input_eml_cb(PublicInbox::Eml->new(\$buf), @args);
	} else {
		# prepare_inputs already validated $ifmt
		my $cb = PublicInbox::MboxReader->reads($ifmt) //
				die "BUG: bad fmt=$ifmt";
		$cb->(undef, $fh, $self->can('input_mbox_cb'), $self, @args);
	}
}

sub input_path_url {
	my ($self, $input, @args) = @_;
	my $lei = $self->{lei};
	my $ifmt = lc($lei->{opt}->{'in-format'} // '');
	# TODO auto-detect?
	if ($input =~ m!\Aimaps?://!i) {
		$lei->{net}->imap_each($input, $self->can('input_imap_cb') //
						$self->can('input_net_cb'),
					$self, @args);
		return;
	} elsif ($input =~ m!\A(?:nntps?|s?news)://!i) {
		$lei->{net}->nntp_each($input, $self->can('input_nntp_cb') //
						$self->can('input_net_cb'),
					$self, @args);
		return;
	}
	if ($input =~ s!\A([a-z0-9]+):!!i) {
		$ifmt = lc($1);
	} elsif ($input =~ /\.(?:patch|eml)\z/i) {
		$ifmt = 'eml';
	}
	my $devfd = $lei->path_to_fd($input) // return;
	if ($devfd >= 0) {
		$self->input_fh($ifmt, $lei->{$devfd}, $input, @args);
	} elsif (-f $input && $ifmt eq 'eml') {
		open my $fh, '<', $input or
					return $lei->fail("open($input): $!");
		$self->input_fh($ifmt, $fh, $input, @args);
	} elsif (-f _) {
		my $m = $lei->{opt}->{'lock'} //
			PublicInbox::MboxLock->defaults;
		my $mbl = PublicInbox::MboxLock->acq($input, 0, $m);
		my $zsfx = PublicInbox::MboxReader::zsfx($input);
		if ($zsfx) {
			my $in = delete $mbl->{fh};
			$mbl->{fh} =
			     PublicInbox::MboxReader::zsfxcat($in, $zsfx, $lei);
		}
		local $PublicInbox::DS::in_loop = 0 if $zsfx; # dwaitpid
		$self->input_fh($ifmt, $mbl->{fh}, $input, @args);
	} elsif (-d _ && (-d "$input/cur" || -d "$input/new")) {
		return $lei->fail(<<EOM) if $ifmt && $ifmt ne 'maildir';
$input appears to a be a maildir, not $ifmt
EOM
		PublicInbox::MdirReader->new->maildir_each_eml($input,
					$self->can('input_maildir_cb'),
					$self, @args);
	} else {
		$lei->fail("$input unsupported (TODO)");
	}
}

sub prepare_inputs { # returns undef on error
	my ($self, $lei, $inputs) = @_;
	my $in_fmt = $lei->{opt}->{'in-format'};
	my $sync = $lei->{opt}->{sync} ? {} : undef; # using LeiMailSync
	if ($lei->{opt}->{stdin}) {
		@$inputs and return
			$lei->fail("--stdin and @$inputs do not mix");
		check_input_format($lei) or return;
		push @$inputs, '/dev/stdin';
		push @{$sync->{no}}, '/dev/stdin' if $sync;
	}
	my $net = $lei->{net}; # NetWriter may be created by l2m
	my (@f, @d);
	# e.g. Maildir:/home/user/Mail/ or imaps://example.com/INBOX
	for my $input (@$inputs) {
		my $input_path = $input;
		if ($input =~ m!\A(?:imaps?|nntps?|s?news)://!i) {
			require PublicInbox::NetReader;
			$net //= PublicInbox::NetReader->new;
			$net->add_url($input);
			if ($sync) {
				if ($input =~ m!\Aimaps?://!) {
					push @{$sync->{ok}}, $input;
				} else {
					push @{$sync->{no}}, $input;
				}
			}
		} elsif ($input_path =~ s/\A([a-z0-9]+)://is) {
			my $ifmt = lc $1;
			if (($in_fmt // $ifmt) ne $ifmt) {
				return $lei->fail(<<"");
--in-format=$in_fmt and `$ifmt:' conflict

			}
			if ($sync) {
				if ($ifmt =~ /\A(?:maildir|mh)\z/i) {
					push @{$sync->{ok}}, $input;
				} else {
					push @{$sync->{no}}, $input;
				}
			}
			my $devfd = $lei->path_to_fd($input_path) // return;
			if ($devfd >= 0 || (-f $input_path || -p _)) {
				require PublicInbox::MboxLock;
				require PublicInbox::MboxReader;
				PublicInbox::MboxReader->reads($ifmt) or return
					$lei->fail("$ifmt not supported");
			} elsif (-d $input_path) {
				require PublicInbox::MdirReader;
				$ifmt eq 'maildir' or return
					$lei->fail("$ifmt not supported");
				$input = $lei->abs_path($input) if $sync;
			} else {
				return $lei->fail("Unable to handle $input");
			}
		} elsif ($input =~ /\.(eml|patch)\z/i && -f $input) {
			lc($in_fmt//'eml') eq 'eml' or return $lei->fail(<<"");
$input is `eml', not --in-format=$in_fmt

			require PublicInbox::Eml;
			push @{$sync->{no}}, $input if $sync;
		} else {
			my $devfd = $lei->path_to_fd($input) // return;
			if ($devfd >= 0 || -f $input || -p _) {
				push @{$sync->{no}}, $input if $sync;
				push @f, $input;
			} elsif (-d $input) {
				if ($sync) {
					$input = $lei->abs_path($input);
					push @{$sync->{ok}}, $input;
				}
				push @d, $input;
			} else {
				return $lei->fail("Unable to handle $input")
			}
		}
	}
	if (@f) { check_input_format($lei, \@f) or return }
	if (@d) { # TODO: check for MH vs Maildir, here
		require PublicInbox::MdirReader;
	}
	if ($sync && $sync->{no}) {
		return $lei->fail(<<"") if !$sync->{ok};
--sync specified but no inputs support it

		# non-fatal if some inputs support support sync
		$lei->err("# --sync will only be used for @{$sync->{ok}}");
		$lei->err("# --sync is not supported for: @{$sync->{no}}");
	}
	if ($net) {
		if (my $err = $net->errors) {
			return $lei->fail($err);
		}
		$net->{quiet} = $lei->{opt}->{quiet};
		require PublicInbox::LeiAuth;
		$lei->{auth} //= PublicInbox::LeiAuth->new;
		$lei->{net} //= $net;
	}
	$self->{inputs} = $inputs;
}

sub process_inputs {
	my ($self) = @_;
	for my $input (@{$self->{inputs}}) {
		$self->input_path_url($input);
	}
	my $wait = $self->{lei}->{sto}->ipc_do('done') if $self->{lei}->{sto};
}

sub input_only_atfork_child {
	my ($self) = @_;
	my $lei = $self->{lei};
	$lei->_lei_atfork_child;
	PublicInbox::IPC::ipc_atfork_child($self);
	$lei->{auth}->do_auth_atfork($self) if $lei->{auth};
	undef;
}

# like Getopt::Long, but for +kw:FOO and -kw:FOO to prepare
# for update_xvmd -> update_vmd
sub vmd_mod_extract {
	my $argv = $_[-1];
	my $vmd_mod = {};
	my @new_argv;
	for my $x (@$argv) {
		if ($x =~ /\A(\+|\-)(kw|L):(.+)\z/) {
			my ($op, $pfx, $val) = ($1, $2, $3);
			if (my $err = $ERR{$pfx}->($val)) {
				push @{$vmd_mod->{err}}, $err;
			} else { # set "+kw", "+L", "-L", "-kw"
				push @{$vmd_mod->{$op.$pfx}}, $val;
			}
		} else {
			push @new_argv, $x;
		}
	}
	@$argv = @new_argv;
	$vmd_mod;
}

1;
debug log:

solving d11d23d4 ...
found d11d23d4 in public-inbox.git

user/dev discussion of public-inbox itself

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